Element

i cant get sound out of rca cable correctly connected into tv while connected into a external audio. Please help.

Hi, I recently noticed that there is no longer any sound coming from my TV. It is an Element TV, model elefw408 connected to the cable box (wireless receiver, AT&T) with an HDMI cable. It used to work fine. I have not used this TV for about half a year, last time I used it changing the volume...